Depending on the Country, a Baritone is Not a Baritone
The instrument called a "baritone" in Japan and the U.K. is called a "tenor horn" in German-speaking countries. And, what we typically call a "euphonium" is quite like what they call a "baritone" in Germany. Baritones are extremely popular in Germany. They are the darling of brass bands and far more common than trumpets. They use rotary valves and are oval-shaped, like an egg. Although they resemble a Wagner tuba, the bell faces the opposite direction and the tubes are of a different thickness.